cost
Estimate cost of implementing filter System object
Description
Examples
Cost of FIR Filter
This example shows how to compute the cost of implementing an FIR Filter created using dsp.FIRFilter
object.
Fs = 8000;
Fcutoff = 2000;
firFilt = dsp.FIRFilter('Numerator',designLowpassFIR(FilterOrder=130,CutoffFrequency=Fcutoff/(Fs/2)));
cost(firFilt)
ans = struct with fields:
NumCoefficients: 131
NumStates: 130
MultiplicationsPerInputSample: 131
AdditionsPerInputSample: 130
Input Arguments
sysobj
— Input filter
filter System object
Input filter, specified as one of the following filter System objects:
arithType
— Arithmetic type
'double'
(default) | 'single'
| 'Fixed'
Arithmetic used in the filter analysis, specified as 'double'
,
'single'
, or 'Fixed'
. When the arithmetic
input is not specified and the filter System object is unlocked, the analysis tool assumes a double-precision filter. When the
arithmetic input is not specified and the System object is locked, the function performs the analysis based on the data type of
the locked input.
The 'Fixed'
value applies to filter System objects with fixed-point
properties only.
When the 'Arithmetic'
input argument is specified as
'Fixed'
and the filter object has the data type of the
coefficients set to 'Same word length as input'
, the arithmetic
analysis depends on whether the System object is unlocked or locked.
unlocked –– The analysis object function cannot determine the coefficients data type. The function assumes that the coefficients data type is signed, has a 16-bit word length, and is auto scaled. The function performs fixed-point analysis based on this assumption.
locked –– When the input data type is
'double'
or'single'
, the analysis object function cannot determine the coefficients data type. The function assumes that the data type of the coefficients is signed, has a 16-bit word length, and is auto scaled. The function performs fixed-point analysis based on this assumption.
To check if the System object is locked or unlocked, use the isLocked
function.
When the arithmetic input is specified as 'Fixed'
and the filter
object has the data type of the coefficients set to a custom numeric type, the object
function performs fixed-point analysis based on the custom numeric data type.
Output Arguments
c
— cost estimate
struct
Cost estimate, c
contains the following fields:
Estimated Value | Description |
---|---|
| Number of filter coefficients (excluding coefficients with values 0, 1 or -1) |
| Number of filter states |
| Number of multiplication operations performed for each input sample |
| Number of addition operations performed for each input sample |
Version History
Introduced in R2011aR2024b: Support for dsp.VariableFIRDecimator
and dsp.VariableFIRInterpolator
Objects
Starting in R2024b, the cost
analysis function supports the
dsp.VariableFIRDecimator
and dsp.VariableFIRInterpolator
objects.
R2024b: dsp.BiquadFilter
object warns
The dsp.BiquadFilter
object issues a warning and will be removed
in a future release. Use the dsp.SOSFilter
object instead. For more information on how to replace
your existing code, see the Compatibility Considerations
section in the dsp.BiquadFilter
reference page.
R2023b: Support for dsp.ParallelFilter
and dsp.Delay
Objects
Starting in R2023b, the cost
analysis function supports the
dsp.ParallelFilter
and the dsp.Delay
objects.
R2023b: dsp.BiquadFilter
object will be removed
The dsp.BiquadFilter
object will be removed in a future release.
Use the dsp.SOSFilter
object instead.
See Also
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